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. 2021 Nov 26;22(23):12805. doi: 10.3390/ijms222312805

Figure 2.

Figure 2

(a) The biosynthesis and metabolism of TIQs (R1: H, CH3, alkyl, aryl; R2: H, OH, OCH3; R3: H, OH, OCH3; R4: H, COOH) [31,32]; (b) the structure of TIQ, N-methyl-TIQ, 1-methyl-TIQ, 1-BnTIQ.